In a triangle ABC, ab and c are the side...

In a triangle ABC, ab and c are the sides of the triangle satisfying the relation `r_(1)+r_(2) = r_(3)-r` then the perimeter of the triangle

`(2ab)/(a+b-c)`

`(ab)/(a+c-b)`

`(ab)/(a-b-c)`

`(bc)/(b+c-a)`

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